From DAT:

Work From 1830
Work To 1957
Tools CARPENTER TOOLS,FARM TOOLS,LEVELS,MARKING GAUGES,SAW
TOOLS,SAWS,SCREWDRIVERS,SHAVES
Text Info The original William was succeeded by William Jr. ca. 1864;
William Jr. ran it until ca. 1910.

On Mon, Dec 11, 2017 at 2:51 PM, John Ruth  wrote:

>
> Do you have the years in which Wm. Johnson operated in Newark? That would
> be a clue because WIlliam Sellers presented his threading system at the
> Franklin Institute on   September 15, 1864.  If your wing dividers are
> after that date, but before the adoption of the current threading system,
> then Sellers threads are likely.
>

-- 
Kirk Eppler In HMB, CA